Ari J. Wassner is Director of the Endocrinology Fellowship Training Program at Boston Children’s Hospital. He earned his MD from Harvard Medical School and completed residency in Pediatrics at Boston Children’s Hospital, where he also served as Chief Resident. He completed fellowship in Pediatric Endocrinology at Boston Children’s Hospital. Dr. Wassner is a member of the American Thyroid Association Trainees and Career Advancement Committee, the Boston Children’s Hospital Graduate Medical Committee, and the teaching Academies at both Boston Children’s Hospital and Harvard Medical School. In addition to resident and fellow education, he is participates in preclinical medical education and curriculum development at Harvard Medical School, for which he received the 2017 Masland Award for Excellence in Teaching. Dr. Wassner is also Co-Director of the Thyroid Center at Boston Children’s Hospital. His basic research has investigated the role of thyroid hormone metabolism in modulating local and systemic thyroid hormone signaling in disease states including heart failure and liver injury. In addition to practicing general pediatric endocrinology, Dr. Wassner’s clinical and research interest is primarily in pediatric thyroid disease, with a particular focus on congenital hypothyroidism and on thyroid neoplasia in children, and he conducts clinical research in these areas.